/**
 * @file
 * Management Information Base II (RFC1213) SNMP objects and functions.
 */

/*
 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * Author: Dirk Ziegelmeier <dziegel@gmx.de>
 *         Christiaan Simons <christiaan.simons@axon.tv>
 */

#include "lwip/snmp.h"
#include "lwip/apps/snmp.h"
#include "lwip/apps/snmp_core.h"
#include "lwip/apps/snmp_mib2.h"
#include "lwip/apps/snmp_scalar.h"

#if LWIP_SNMP && SNMP_LWIP_MIB2

#define MIB2_AUTH_TRAPS_ENABLED  1
#define MIB2_AUTH_TRAPS_DISABLED 2

/* --- snmp .1.3.6.1.2.1.11 ----------------------------------------------------- */
static s16_t
snmp_get_value(const struct snmp_scalar_array_node_def* node, void* value)
{
	u32_t* uint_ptr = (u32_t*)value;

	switch(node->oid) {
		case 1: /* snmpInPkts */
			*uint_ptr = snmp_stats.inpkts;
			break;

		case 2: /* snmpOutPkts */
			*uint_ptr = snmp_stats.outpkts;
			break;

		case 3: /* snmpInBadVersions */
			*uint_ptr = snmp_stats.inbadversions;
			break;

		case 4: /* snmpInBadCommunityNames */
			*uint_ptr = snmp_stats.inbadcommunitynames;
			break;

		case 5: /* snmpInBadCommunityUses */
			*uint_ptr = snmp_stats.inbadcommunityuses;
			break;

		case 6: /* snmpInASNParseErrs */
			*uint_ptr = snmp_stats.inasnparseerrs;
			break;

		case 8: /* snmpInTooBigs */
			*uint_ptr = snmp_stats.intoobigs;
			break;

		case 9: /* snmpInNoSuchNames */
			*uint_ptr = snmp_stats.innosuchnames;
			break;

		case 10: /* snmpInBadValues */
			*uint_ptr = snmp_stats.inbadvalues;
			break;

		case 11: /* snmpInReadOnlys */
			*uint_ptr = snmp_stats.inreadonlys;
			break;

		case 12: /* snmpInGenErrs */
			*uint_ptr = snmp_stats.ingenerrs;
			break;

		case 13: /* snmpInTotalReqVars */
			*uint_ptr = snmp_stats.intotalreqvars;
			break;

		case 14: /* snmpInTotalSetVars */
			*uint_ptr = snmp_stats.intotalsetvars;
			break;

		case 15: /* snmpInGetRequests */
			*uint_ptr = snmp_stats.ingetrequests;
			break;

		case 16: /* snmpInGetNexts */
			*uint_ptr = snmp_stats.ingetnexts;
			break;

		case 17: /* snmpInSetRequests */
			*uint_ptr = snmp_stats.insetrequests;
			break;

		case 18: /* snmpInGetResponses */
			*uint_ptr = snmp_stats.ingetresponses;
			break;

		case 19: /* snmpInTraps */
			*uint_ptr = snmp_stats.intraps;
			break;

		case 20: /* snmpOutTooBigs */
			*uint_ptr = snmp_stats.outtoobigs;
			break;

		case 21: /* snmpOutNoSuchNames */
			*uint_ptr = snmp_stats.outnosuchnames;
			break;

		case 22: /* snmpOutBadValues */
			*uint_ptr = snmp_stats.outbadvalues;
			break;

		case 24: /* snmpOutGenErrs */
			*uint_ptr = snmp_stats.outgenerrs;
			break;

		case 25: /* snmpOutGetRequests */
			*uint_ptr = snmp_stats.outgetrequests;
			break;

		case 26: /* snmpOutGetNexts */
			*uint_ptr = snmp_stats.outgetnexts;
			break;

		case 27: /* snmpOutSetRequests */
			*uint_ptr = snmp_stats.outsetrequests;
			break;

		case 28: /* snmpOutGetResponses */
			*uint_ptr = snmp_stats.outgetresponses;
			break;

		case 29: /* snmpOutTraps */
			*uint_ptr = snmp_stats.outtraps;
			break;

		case 30: /* snmpEnableAuthenTraps */
			if(snmp_get_auth_traps_enabled() == SNMP_AUTH_TRAPS_DISABLED) {
				*uint_ptr = MIB2_AUTH_TRAPS_DISABLED;
			} else {
				*uint_ptr = MIB2_AUTH_TRAPS_ENABLED;
			}

			break;

		case 31: /* snmpSilentDrops */
			*uint_ptr = 0; /* not supported */
			break;

		case 32: /* snmpProxyDrops */
			*uint_ptr = 0; /* not supported */
			break;

		default:
			LWIP_DEBUGF(SNMP_MIB_DEBUG, ("snmp_get_value(): unknown id: %"S32_F"\n", node->oid));
			return 0;
	}

	return sizeof(*uint_ptr);
}

static snmp_err_t
snmp_set_test(const struct snmp_scalar_array_node_def* node, u16_t len, void* value)
{
	snmp_err_t ret = SNMP_ERR_WRONGVALUE;
	LWIP_UNUSED_ARG(len);

	if(node->oid == 30) {
		/* snmpEnableAuthenTraps */
		s32_t* sint_ptr = (s32_t*)value;

		/* we should have writable non-volatile mem here */
		if((*sint_ptr == MIB2_AUTH_TRAPS_DISABLED) || (*sint_ptr == MIB2_AUTH_TRAPS_ENABLED)) {
			ret = SNMP_ERR_NOERROR;
		}
	}

	return ret;
}

static snmp_err_t
snmp_set_value(const struct snmp_scalar_array_node_def* node, u16_t len, void* value)
{
	LWIP_UNUSED_ARG(len);

	if(node->oid == 30) {
		/* snmpEnableAuthenTraps */
		s32_t* sint_ptr = (s32_t*)value;

		if(*sint_ptr == MIB2_AUTH_TRAPS_DISABLED) {
			snmp_set_auth_traps_enabled(SNMP_AUTH_TRAPS_DISABLED);
		} else {
			snmp_set_auth_traps_enabled(SNMP_AUTH_TRAPS_ENABLED);
		}
	}

	return SNMP_ERR_NOERROR;
}

/* the following nodes access variables in SNMP stack (snmp_stats) from SNMP worker thread -> OK, no sync needed */
static const struct snmp_scalar_array_node_def snmp_nodes[] = {
	{ 1, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInPkts */
	{ 2, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpOutPkts */
	{ 3, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInBadVersions */
	{ 4, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInBadCommunityNames */
	{ 5, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInBadCommunityUses */
	{ 6, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInASNParseErrs */
	{ 8, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInTooBigs */
	{ 9, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInNoSuchNames */
	{10, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInBadValues */
	{11, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInReadOnlys */
	{12, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInGenErrs */
	{13, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInTotalReqVars */
	{14, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInTotalSetVars */
	{15, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInGetRequests */
	{16, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInGetNexts */
	{17, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInSetRequests */
	{18, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInGetResponses */
	{19, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpInTraps */
	{20, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpOutTooBigs */
	{21, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpOutNoSuchNames */
	{22, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpOutBadValues */
	{24, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpOutGenErrs */
	{25, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpOutGetRequests */
	{26, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpOutGetNexts */
	{27, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpOutSetRequests */
	{28, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpOutGetResponses */
	{29, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpOutTraps */
	{30, SNMP_ASN1_TYPE_INTEGER, SNMP_NODE_INSTANCE_READ_WRITE}, /* snmpEnableAuthenTraps */
	{31, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY},  /* snmpSilentDrops */
	{32, SNMP_ASN1_TYPE_COUNTER, SNMP_NODE_INSTANCE_READ_ONLY}   /* snmpProxyDrops */
};

const struct snmp_scalar_array_node snmp_mib2_snmp_root = SNMP_SCALAR_CREATE_ARRAY_NODE(11, snmp_nodes, snmp_get_value, snmp_set_test, snmp_set_value);

#endif /* LWIP_SNMP && SNMP_LWIP_MIB2 */
